/* Data structure giving per-block information. */
typedef union {
- /* Heap information for a busy block. */
- struct {
- /* Zero for a large block, or positive giving the
+ /* Heap information for a busy block. */
+ struct {
+ /* Zero for a large block, or positive giving the
logarithm to the base two of the fragment size. */
- int type;
- union {
- struct {
- size_t nfree; /* Free fragments in a fragmented block. */
- size_t first; /* First free fragment of the block. */
- } frag;
- struct {
- size_t size; /* Size (in blocks) of a large cluster. */
- size_t busy_size;
- } block;
- } info;
- } busy;
- /* Heap information for a free block (that may be the first of
+ int type;
+ union {
+ struct {
+ size_t nfree; /* Free fragments in a fragmented block. */
+ size_t first; /* First free fragment of the block. */
+ } frag;
+ struct {
+ size_t size; /* Size (in blocks) of a large cluster. */
+ size_t busy_size;
+ } block;
+ } info;
+ } busy;
+ /* Heap information for a free block (that may be the first of
a free cluster). */
- struct {
- size_t size; /* Size (in blocks) of a free cluster. */
- size_t next; /* Index of next free cluster. */
- size_t prev; /* Index of previous free cluster. */
- } free;
+ struct {
+ size_t size; /* Size (in blocks) of a free cluster. */
+ size_t next; /* Index of next free cluster. */
+ size_t prev; /* Index of previous free cluster. */
+ } free;
} malloc_info;
-/* List of blocks allocated with `mmemalign' (or `mvalloc'). */
-
-struct alignlist {
- struct alignlist *next;
- void *aligned; /* The address that mmemaligned returned. */
- void *exact; /* The address that malloc returned. */
-};
-
/* Doubly linked lists of free fragments. */
-
struct list {
- struct list *next;
- struct list *prev;
+ struct list *next;
+ struct list *prev;
};
/* Internal structure that defines the format of the malloc-descriptor.
struct mdesc {
- /* Semaphore locking the access to the heap */
- sem_t sem;
+ /* Semaphore locking the access to the heap */
+ sem_t sem;
- /* Number of processes that attached the heap */
- unsigned int refcount;
+ /* Number of processes that attached the heap */
+ unsigned int refcount;
- /* Chained lists of mdescs */
- struct mdesc *next_mdesc;
-
- /* The "magic number" for an mmalloc file. */
- char magic[MMALLOC_MAGIC_SIZE];
+ /* Chained lists of mdescs */
+ struct mdesc *next_mdesc;
- /* The size in bytes of this structure, used as a sanity check when reusing
+ /* The "magic number" for an mmalloc file. */
+ char magic[MMALLOC_MAGIC_SIZE];
+
+ /* The size in bytes of this structure, used as a sanity check when reusing
a previously created mapped file. */
- unsigned int headersize;
+ unsigned int headersize;
- /* The version number of the mmalloc package that created this file. */
- unsigned char version;
+ /* The version number of the mmalloc package that created this file. */
+ unsigned char version;
- /* Some flag bits to keep track of various internal things. */
- unsigned int flags;
+ /* Some flag bits to keep track of various internal things. */
+ unsigned int flags;
- /* Number of info entries. */
- size_t heapsize;
+ /* Number of info entries. */
+ size_t heapsize;
- /* Pointer to first block of the heap (base of the first block). */
- void *heapbase;
+ /* Pointer to first block of the heap (base of the first block). */
+ void *heapbase;
- /* Current search index for the heap table. */
- /* Search index in the info table. */
- size_t heapindex;
+ /* Current search index for the heap table. */
+ /* Search index in the info table. */
+ size_t heapindex;
- /* Limit of valid info table indices. */
- size_t heaplimit;
+ /* Limit of valid info table indices. */
+ size_t heaplimit;
- /* Block information table.
+ /* Block information table.
Allocated with malign/__mmalloc_free (not mmalloc/mfree). */
- /* Table indexed by block number giving per-block information. */
+ /* Table indexed by block number giving per-block information. */
- malloc_info *heapinfo;
+ malloc_info *heapinfo;
- /* Free list headers for each fragment size. */
- /* Free lists for each fragment size. */
+ /* Free list headers for each fragment size. */
+ /* Free lists for each fragment size. */
- struct list fraghead[BLOCKLOG];
+ struct list fraghead[BLOCKLOG];
- /* List of blocks allocated by memalign. */
+ /* List of blocks allocated by memalign. */
- struct alignlist *aligned_blocks;
+ struct alignlist *aligned_blocks;
- /* The base address of the memory region for this malloc heap. This
+ /* The base address of the memory region for this malloc heap. This
is the location where the bookkeeping data for mmap and for malloc
begins. */
- void *base;
+ void *base;
- /* The current location in the memory region for this malloc heap which
+ /* The current location in the memory region for this malloc heap which
represents the end of memory in use. */
- void *breakval;
+ void *breakval;
- /* The end of the current memory region for this malloc heap. This is
+ /* The end of the current memory region for this malloc heap. This is
the first location past the end of mapped memory. */
- void *top;
+ void *top;
- /* Open file descriptor for the file to which this malloc heap is mapped.
+ /* Open file descriptor for the file to which this malloc heap is mapped.
This will always be a valid file descriptor, since /dev/zero is used
by default if no open file is supplied by the client. Also note that
it may change each time the region is mapped and unmapped. */
- int fd;
+ int fd;
};
extern struct mdesc *__mmalloc_default_mdp;
-/* Initialize the first use of the default malloc descriptor, which uses
- an sbrk() region. */
-
-extern struct mdesc *__mmalloc_create_default_mdp(void);
-
/* Remap a mmalloc region that was previously mapped. */
-extern void *__mmalloc_remap_core(struct mdesc *mdp);
+extern void *__mmalloc_remap_core(xbt_mheap_t mdp);
/* Get core for the memory region specified by MDP, using SIZE as the
amount to either add to or subtract from the existing region. Works
/* Thread-safety (if the sem is already created) FIXME: KILLIT*/
#define LOCK(mdp) \
- sem_wait(&mdp->sem)
+ sem_wait(&mdp->sem)
#define UNLOCK(mdp) \
- sem_post(&mdp->sem)
+ sem_post(&mdp->sem)
#endif /* __MMPRIVATE_H */
